package com.swpu.demo.interceptor;

import com.auth0.jwt.exceptions.AlgorithmMismatchException;
import com.auth0.jwt.exceptions.SignatureVerificationException;
import com.auth0.jwt.exceptions.TokenExpiredException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.swpu.demo.utils.JWTUtil;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.HashMap;
import java.util.Map;

@Component
public class JWTInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        Map<String, Object> map=new HashMap<>();
        //获取请求头中的令牌
        String token = request.getHeader("token");
        if(request.getRequestURI().contains("register") || request.getRequestURI().contains("login")){
            map.put("state",true); //设置状态
        }else {
            try{
                JWTUtil.verify(token);   //验证令牌
                map.put("state",true); //设置状态
                return true;    //放行请求
            }catch (SignatureVerificationException e){
                e.printStackTrace();
                map.put("msg","无效签名！");
            }catch (TokenExpiredException e){
                e.printStackTrace();
                map.put("msg","token过期！");
            }catch (AlgorithmMismatchException e){
                e.printStackTrace();
                map.put("msg","token算法不一致！");
            }catch (Exception e){
                e.printStackTrace();
                map.put("msg","token无效！");
            }
            map.put("state",false); //设置状态
            return false;
        }

        //将map 转为json  jackson
//        String json = new ObjectMapper().writeValueAsString(map);
//        response.setContentType("application/json;charset=UTF-8");
//        response.getWriter().println(json);
        return true;
    }
}
